/**
 * ----------------------------------------------------------------------------------------
 * 9. CODE NHẬN EMAIL KHÁCH HÀNG - SMTP
 * ----------------------------------------------------------------------------------------
 */
add_action( 'phpmailer_init', function( $phpmailer ) {
    if ( ! is_object( $phpmailer ) ) {
        $phpmailer = (object) $phpmailer;
    }
    $phpmailer->Mailer     = 'smtp';
    $phpmailer->Host       = 'smtp.gmail.com';
    $phpmailer->SMTPAuth   = true;
    $phpmailer->Port       = 587;
    $phpmailer->Username   = 'nghiem2k7qnvn@gmail.com'; 
    $phpmailer->Password   = 'vayzcvglgrctpqxv';
    $phpmailer->SMTPSecure = 'tls';  
    $phpmailer->From       = 'nghiem2k7qnvn@gmail.com';
    $phpmailer->FromName   = 'Khách hàng điền Form';
});
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="https://nghiemsport.io.vn/wp-sitemap-index.xsl" ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-posts-post-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-posts-page-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-posts-blocks-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-posts-product-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-posts-featured_item-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-taxonomies-category-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-taxonomies-product_cat-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-taxonomies-featured_item_category-1.xml</loc></sitemap><sitemap><loc>https://nghiemsport.io.vn/wp-sitemap-users-1.xml</loc></sitemap></sitemapindex>